!(function (window, document) {
    function GVerify(options) {
        //创建一个图形验证码对象，接收options对象为参数
        this.options = {
            //默认options参数值
            id: '', //容器Id
            canvasId: 'verifyCanvas', //canvas的ID
            width: '150', //默认canvas宽度
            height: '30', //默认canvas高度
            type: 'blend', //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
            code: '',
        }

        if (Object.prototype.toString.call(options) == '[object Object]') {
            //判断传入参数类型
            for (var i in options) {
                //根据传入的参数，修改默认参数值
                this.options[i] = options[i]
            }
        } else {
            this.options.id = options
        }

        this.options.numArr = '0,1,2,3,4,5,6,7,8,9'.split(',')
        this.options.letterArr = getAllLetter()

        this._init()
        this.refresh()
    }

    GVerify.prototype = {
        /**版本号**/
        version: '1.0.0',

        /**初始化方法**/
        _init: function () {
            var con = document.getElementById(this.options.id)
            var canvas = document.createElement('canvas')
            this.options.width = con.offsetWidth > 0 ? con.offsetWidth : '150'
            this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30'
            canvas.id = this.options.canvasId
            canvas.width = this.options.width
            canvas.height = this.options.height
            canvas.style.cursor = 'pointer'
            canvas.innerHTML = '您的浏览器版本不支持canvas'
            con.appendChild(canvas)
            var parent = this
            canvas.onclick = function () {
                parent.refresh()
            }
        },

        /**生成验证码**/
        refresh: function () {
            this.options.code = ''
            var canvas = document.getElementById(this.options.canvasId)
            if (canvas.getContext) {
                var ctx = canvas.getContext('2d')
            }
            ctx.textBaseline = 'middle'

            ctx.fillStyle = randomColor(180, 240)
            ctx.fillRect(0, 0, this.options.width, this.options.height)

            if (this.options.type == 'blend') {
                //判断验证码类型
                var txtArr = this.options.numArr.concat(this.options.letterArr)
            } else if (this.options.type == 'number') {
                var txtArr = this.options.numArr
            } else {
                var txtArr = this.options.letterArr
            }

            for (var i = 1; i <= 6; i++) {
                var txt = txtArr[randomNum(0, txtArr.length)]
                this.options.code += txt
                ctx.font =
                    randomNum(this.options.height / 2, this.options.height) + 'px SimHei' //随机生成字体大小
                ctx.fillStyle = randomColor(50, 160) //随机生成字体颜色
                ctx.shadowOffsetX = randomNum(-3, 3)
                ctx.shadowOffsetY = randomNum(-3, 3)
                ctx.shadowBlur = randomNum(-5, 5)
                ctx.shadowColor = 'rgba(0, 0, 0, 0.5)'
                var x = (this.options.width / 9) * i
                var y = this.options.height / 2
                var deg = randomNum(-30, 30)
                /**设置旋转角度和坐标原点**/
                ctx.translate(x, y)
                ctx.rotate((deg * Math.PI) / 180)
                ctx.fillText(txt, 0, 0)
                /**恢复旋转角度和坐标原点**/
                ctx.rotate((-deg * Math.PI) / 180)
                ctx.translate(-x, -y)
            }
            //输出验证码
            console.log(this.options.code)
            /**绘制干扰线**/
            for (var i = 0; i < 4; i++) {
                ctx.strokeStyle = randomColor(40, 180)
                ctx.beginPath()
                ctx.moveTo(
                    randomNum(0, this.options.width),
                    randomNum(0, this.options.height)
                )
                ctx.lineTo(
                    randomNum(0, this.options.width),
                    randomNum(0, this.options.height)
                )
                ctx.stroke()
            }
            /**绘制干扰点**/
            for (var i = 0; i < this.options.width / 4; i++) {
                ctx.fillStyle = randomColor(0, 255)
                ctx.beginPath()
                ctx.arc(
                    randomNum(0, this.options.width),
                    randomNum(0, this.options.height),
                    1,
                    0,
                    2 * Math.PI
                )
                ctx.fill()
            }
        },

        /**验证验证码**/
        validate: function (code) {
            var code = code.toLowerCase()
            var v_code = this.options.code.toLowerCase()
            console.log(v_code)
            if (code == v_code) {
                return true
            } else {
                return false
            }
        },
    }
    /**生成字母数组**/
    function getAllLetter() {
        var letterStr =
            'a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z'
        return letterStr.split(',')
    }
    /**生成一个随机数**/
    function randomNum(min, max) {
        return Math.floor(Math.random() * (max - min) + min)
    }
    /**生成一个随机色**/
    function randomColor(min, max) {
        var r = randomNum(min, max)
        var g = randomNum(min, max)
        var b = randomNum(min, max)
        return 'rgb(' + r + ',' + g + ',' + b + ')'
    }
    window.GVerify = GVerify
})(window, document)